Boring-bar.



No. 847,788. PATBNTED MAR. 19, 1907.

R. F. LACE.

BORING BAR.

APPLICATION FILED MAE.26, 1906.

n AYiioNn r. Laon, or eoiiiiiiirsonio.

BORING-BAH.

Specification of Letters Patent.

:atenten March 19, 19'7.

Application filed March 26, 1906. Serial No. 308.015

To alt 1li/1,0mY if muy r'on/cr'l'lif:

Be it known that I, Rai'noxn F. linen, a citizen of the lvnited States, residing at Columbus, in the count)v of Franklin and State of Ohio, have invented certain new and useful improvements in Boringdars; and l do l hereby declare the following to be a full clear, and exact description of the invention, such as will enable others skilled in the art to which it appeitains to make and use the same.

The object of this invention is to provide improved and simplified means for nicely and quickly adjusting the cutting-tools of boringbars.

In the accompanying drawings, showing one embodiment of the invention, Figure 1 is 'an elevation. of a broken bar, showing the toolfholding end in section, said seet-ion being taken on the line a: dr of Fig. 2. elevation of a broken bar looking tmvardthe left-hand side of Fig. l. Fig. 3 is an elevation of a broken har, illustrating the lower end thereof in section, said section being taken on a line y y of Fig. i. Fig. 4 is a sectional view,on an enlargedscale,on the line z z of Fig. l. Fig. 5 is a side view of the pin for confining the adjusting-screw, and Fig. 6 is an end view of said pin.

In the several views7 1 designates the toolholding bar, which has in theiusiness end of it a diametrical opening, in which turns a right and left hand threaded adjusting-screw 2. This screw 2 is-provided at its middle or between the threads of different direct-ion an 3 annular groove 3,int`o the opposite sides of which project the ends of pins 4 to confine or )revent longitudinal movement of said screw.

tool olding bar, extending at right angles to th o ening in which the adjusting-screw is scato( and these pins are held in place by plug-screws 5, threaded into the outer ends of theL-holes.

7 7 designate the cutting-tools, which bear or are engaged by the adjustment-l)locks 6 6.

lying in a laterally-extended opening below and parallehto that in whieh the adjustingscrew turns. The reason lor the lateral extension ofthe openingi'or the blocks (i 6 is this:

When the tool -is locked by the set-screw Fig. 2 is an Ihe pins 4 are passed through holes in the i f aft-er ailjustnient, as hereinafter described, the upward pressure of the block is against the bar instead of against the adjustingsaid blocks, as shown, are toothed or rougliened to engage corres ionding surfaces on the cutting-tools 7 7. ll shall denominate the blocks (i ailjnstment-ldocks.

One end of the adjusting-serew can be provided with a dial h'. containing a scale to cogoperate with a niark on a small plate 9 to indicate the extent of rotation of the screw, and' therefore thi` exteilt of inward or outward movement of the tools 7 7. The adjustingscrew ean be turned by means of a key or wrench inserted in an appropriate socket 10 in one end of the ad justing-se-rew.

f Ait-er adjustment of the tools they are throng i the end of the stock and pinching the tool, and the blocks then bear toward the seat for the latter in the boring-bar. What I claim, and desire to secure by Letters Patent, is-v l. In a boring-tool, the combination ofthe j to be moved by said screw, op ositely-movable adjustment-blocks locate between the engaged b v the screw and engaginor the tools, i bearings for the adjustment-b oaks integral with the bar and between the screw and the blocks together against said bearings.

2. in a boring-tool, the combination ofthe bar provided with a transverse opening, a right and left hand threaded screw in said o ening but unengaged with the walls thereo means for securing said screw from longi. The ad j listing-screw 2 engages the bloeks (i 6,

tudinal movement, said bar also provided f niiinieating with the opening for the screw, l and said opening being of greater width than the passage-way between said openings wherei b bearings are afforded for the adjustment# i blocks, oppositely movable adjustmentbar, a rightand left hand threaded screw. mounted transversely therein, cutting-toolstool, and means for clamping the tool and held tight by means of set-screws 11, assed screw and thetools, said adjustment-blocks IOO blocks seated in the last-described opening, ment-blocksagainst said seats and x them said adjustment-blocks being threaded to be and the tools n adjustable position.

engaged and moved by said screw inward In testimony whereof I affix my signature und outward, a; tool engagin each of said in presence of two witnesses.l

'j' blocks and independently a justable with RAYMOND F. LACE.

reference thereto, and c1amping-sorews adapt- Witnesses ed to press upon said tools ina, direction ULYssEs R. PETERS, longitudinal to the ber to bind said adjustl BENJ. FINCKEL. 

